Each 10mm cube is using cutting-. Made from real materials with a purity of 99.95 percent , these cubes have clear edges and flat facets to the lowest market tolerances (0.1) mm. They are non- and safe for users of all ages. Our metal cubes feature exceptional purity grades, ranging from 99.5 percent to 99.99 percent for different elements. Each cube is engraved with essential details including chemical symbols, names, atomic numbers, density, purity and atomic mass. Explore a world of elements full of charm, accuracy and authenticity. Vacuum packed to fragile cubes are protected during shipping. This packaging not only preserves the natural appearance of the cubes, but also prevents oxidation, thus ensuring their quality upon arrival. These metal elements cubes are not only suitable for teaching purposes on density, but are an excellent addition to a collection. Its exquisite appearance and precise properties associated with each elements Perfect for classrooms, offices, science classrooms, home and school displays. Unleash your curiosity and explore the wonders of chemistry. size: 2.54cm Material: Metal colour: As Shown Package Contents: 18 x elements Cube Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.